On Fri, 13 Dec 2019 16:00:10 +0000, The Natural Philosopher wrote:

> In fact as a spoof I drew some graphs yeas ago to show that the rise in
> temperature correlated better with the increase in air transport since
> WWII.
>
There actually are some well documented effects - just not the ones you
might expect or necessarily know about.

In the three days after 11/09/2011, when all civil air transport was
grounded in the USA the mean temperature across the continental USA
*rose* by about 2C The effect was attributed to the lack of jet
contrails, which normally lower the average temp by preventing sunlight
from reaching the ground during the day and prevent it radiating into
space at night. Here's a summary:

https://globalnews.ca/news/2934513/empty-skies-after-911-set-the-stage-
for-an-unlikely-climate-change-experiment/


--
Martin    | martin at
Gregorie  | gregorie dot org

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